Employee Login  |   Subscribe  |   Careers  |   Appointments
List All Test Names Beginning With:
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

T4, Free by Equilibrium Dialysis

Referred out for testing

Source Blood
Mnemonic FT4D
Specimen Requirements

1 x 4 mL red top tube (3.5 mL gold top SST tube is also acceptable)

2.6 mL serum; minimum 1.2 mL

CLS staff: Proceed with specimen collection and transport to DSC Accession. DSC Referrals will oversee the physician approval process. 

Note to ordering physician: This test requires review and approval by CLS Medical & Scientific Staff. Please contact CLS Referrals 403-770-3285 for further information on the approval process.

Referral staff: Include name and telephone number of contact physician with the documentation being sent out with the specimen.

Specimen Handling

PSC:
Centrifuge, pour off, and transport serum to DSC. Send specimen in a separate bag with a photocopy of the requisition.

RRL & extra-regional:
Centrifuge, pour off and freeze serum, then transport to DSC. Send specimen in a separate bag with a photocopy of the requisition.

DSC:
Freeze specimens upon receipt in lab; ensure frozen specimens do not thaw.

Additional Information  If FT4 has been ordered without additional wording such as "equilibrium" or "dialysis", see T4, Free (FT4).
Testing Location Mayo Clinic
Testing Frequency
Alternate Name(s) FT4 by Dialysis; FT4 by Equilibrium Dialysis; T4 by Dialysis; T4 by Equilibrium Dialysis; Thyroxine by Dialysis; Thyroxine by Equilibrium Dialysis; Thyroxine, Free by Equilibrium Dialysis
Reference Interval